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To see what factors affect the rate of photosynthesis. Introduction Photosynthesis is the process by which green plants and certain other organisms transform light into chemical energy

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Introduction

Factors affecting photosynthesis Aim To see what factors affect the rate of photosynthesis. Introduction Photosynthesis is the process by which green plants and certain other organisms transform light into chemical energy. In green plants, light energy is captured by chlorophyll in the chloroplasts of the leaves and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds (simple and complex sugars) that are the basis of both plant and animal life. Photosynthesis consists of a number of photochemical and enzymatic reactions. Any acceleration in the process of photosynthesis will naturally result in the production of more organic compounds and consequently more plant growth. For this reason we want to do a research on factors affecting photosynthesis. Photosynthesis is as follows: light energy is used to split water molecules into hydrogen and oxygen. The oxygen, the product which we shall be using as an indicator for the rate, is then defuses out of the leaf. Therefore, if light intensity is increased, light energy is increased and the product, oxygen, is also increased. Photosynthesis is as follows: light energy is used to split water molecules into hydrogen and oxygen. The oxygen, the product which we shall be using as an indicator for the rate, is then expelled through the leaf. ...read more.

Middle

As light intensity halves the rate of photosynthesis will halve. At anytime one or the other three factors will be the limiting factor which is keeping the photosynthesis down at the rate it is. As the light level is raised, the rate of photosynthesis increases steadily but only up to a certain point, beyond that, it won't make any difference because then it'll be either the temperature or the CO� level which is the limiting factor. As with light intensity the amount of CO� will only increase the rate photosynthesis up to a point. As long as light and CO� are in plentiful; supply then the factor limiting photosynthesis must be temperature Result Number Of Bubbles Per Minute Distance Of Lamp Trial 1 Trial 2 Trial 3 Average 0 1 4 3 2.6 5 3 4 3 3.3 10 2 3 2 2.3 15 3 2 1 2 20 2 1 0 1 25 1 1 0 0.66 These results were in the winter that's why the rate of photosynthesis is low. There are three pairs of results because then the results will be more accurate. Another table has been because they results from the summer. ...read more.

Conclusion

This is important in reflecting success only if my prediction was sensible and logical. Just as important is where the experiment was not a success and why. This photosynthesis investigation was probably not performed as accurately as it could have been due to some controllable and uncontrollable conditions it was not accurate because results did not come from a data logger we had to count bubbles if I was to do it again I would use the data logger. Some mistakes can be corrected. While performing the experiment, the piece of pondweed did not photosynthesize at a steady rate, even when the distance from the plant to the light source was kept a constant in the first results table. I had got anomalous because of the light intensity when the light was close the results were fine but when the light moves further back you start to get anomalous results because the light is further away this had effected my conclusion to overcome this problem you could only use one light source and probably change the water every time you move the light back. You could also add temperature into your test and add into your results. When you move the light back the bubbles decrease and that's when the bubbles become to a Holt and that's when it becomes a limiting factor. ...read more.

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